工具类：FileUtil

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package com.hxsmart.intelligentizepos.util;import android.os.Environment;import java.io.File;/** * Created by Administrator on 2016/4/28. */public class FileUtil {    public static String getSdRootPath() {        return Environment.getExternalStorageDirectory() + "";    }    public static String getDownPath() {        return Environment.getExternalStorageDirectory() + "/hxsmart";    }    //判断文件夹是否存在,如果不存在则创建文件夹    public static void isDownFolder(String downFolder) {        File file = new File(downFolder);        if (!file.exists()) {            file.mkdir();        }    }    public static void deleteAllFiles(File root) {        File files[] = root.listFiles();        if (files != null)            for (File f : files) {                if (f.isDirectory()) { // 判断是否为文件夹                    deleteAllFiles(f);                    try {                        f.delete();                    } catch (Exception e) {                    }                } else {                    if (f.exists()) { // 判断是否存在                        deleteAllFiles(f);                        try {                            f.delete();                        } catch (Exception e) {                        }                    }                }            }    }}
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